City had seven different goalscorers in the hammering of the Canaries, but Pellegrini singled out Aguero for special praise after the rout of Chris Hughton's men.
"Kun Aguero is one of the best three or four players in the world," Pellegrini told Sky Sports News.
"He must demonstrate this every game. He must continue working all game because with his quality he'll have a lot of options [to score more]."
The win moves City up to fourth in the Premier League.